JP2002347452A - Cover device for fuel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce exchanging and repairing costs for parts even in the breakage of a tank cover while preventing the breakage of a fuel tank to enhance safety, to facilitate the cleaning of an oil filling port by providing roomy periphery of the oil filling port, and to improve the function of the tank cover as a protector while preventing breakage due to resonance of the fuel tank with the tank cover. SOLUTION: The fuel tank 6 is arranged on the upper side of a crankcase 4 and covered with the tank cover 10. The tank cover 10 consists of a left shoulder cover portion 10a and a right shoulder cover portion 10b for covering left and right shoulder portions of the fuel tank 6, a front shoulder cover portion 10c for covering a front shoulder portion of the fuel tank 6, and a left arm cover portion 10e and a right arm cover portion 10f for covering left and right arm portions of a headlight 13 provided on the front side of the fuel tank 6. The tank cover 10 is divided into a plurality of portions (blocks).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cover device for a fuel tank, and more particularly to a cover device for covering a fuel tank of a horizontal engine.

[0002]

2. Description of the Related Art There are two types of horizontal engines equipped with a fuel tank, in which the fuel tank is exposed, and in which the upper surface of the cooling device and the fuel tank is covered with a bonnet.
If the fuel tank is exposed, for example, when a work machine equipped with an engine falls over, the left and right shoulders and the front shoulder of the fuel tank, and the upper and lower tank parts of the fuel tank, The welded tank flange is easily damaged, and if it is damaged, the entire expensive fuel tank must be replaced. Further, when lifting the engine, there is a possibility that a finger may be hooked on the tank flange, and since the tank flange has the lowest strength in the fuel tank, there is a risk of damage.

When the fuel tank is covered with a bonnet, the fuel tank can be prevented from being damaged and its safety can be enhanced. However, since the bonnet itself is a large part, if the bonnet is damaged, replacement parts cost is high. Also, conventionally, there is no room around the bonnet and the fuel tank filler port,
Foreign matter such as dust easily accumulates in gaps around the filler port, and cleaning is not easy. For this reason, foreign matter such as dust may be mixed into the fuel tank from the filler port, which may cause an abnormality in the fuel supply system due to clogging of the fuel filter or the like.

Further, conventionally, since the fuel tank is rigidly attached to a tank support fixed to the crankcase and the bonnet is rigidly attached to the fuel tank, the fuel tank and the bonnet may be damaged by resonance. Since the load and impact on the hood are transmitted to the fuel tank as it is, the function of the tank cover as a protector is inferior. In addition, since the natural frequency of the fuel tank fluctuates due to a change in the remaining amount of fuel, it is troublesome to take measures against vibrations of both fuel tanks.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and is based on the premise that the fuel tank is prevented from being damaged to enhance its safety. In other words, even if the tank cover is damaged, replacement parts and repairs should be made easier, allowance around the filler port to facilitate cleaning of the filler port, An object of the present invention is to enhance the function of a tank cover as a protector while preventing damage due to resonance with a tank cover.

[0006]

In order to solve the above-mentioned problems, the present invention is configured as follows. That is, claim 1
In the invention described in the above, the cylinder head 2 side of the horizontal engine E is defined as the rear, the crankcase 4 side is defined as the front,
A fuel tank 6 is arranged above the crankcase 4,
In the fuel tank cover device constituted by covering the fuel tank 6 with a tank cover 10, the tank cover 1
Reference numeral 0 denotes a left shoulder cover portion 10a and a right shoulder cover portion 10b that cover left and right shoulder portions of the fuel tank 6, a front shoulder cover portion 10c that covers a front shoulder portion of the fuel tank 6,
A left side cover portion 10e and a right side cover portion 10f that cover left and right side portions of the headlamp 13 provided on the front side of the vehicle, and the tank cover 10 is divided into a plurality of portions. .

According to a second aspect of the present invention, in the fuel tank cover device according to the first aspect, a fuel supply port 8 is provided at a central portion of an upper surface of the fuel tank 6, and a fuel supply port is provided around the fuel supply port 8. The reservoir 9 is recessed, and the upper surface of the fuel tank 6 is covered with the tank cover 10 except for the filler port 8 and the fuel reservoir 9.

According to a third aspect of the present invention, in the fuel tank cover device according to the first or second aspect, the upper tank portion 6a and the lower tank portion 6b of the fuel tank 6 are welded. The tank flange 7 is attached to the tank cover 10.
It is characterized by being covered with.

According to a fourth aspect of the present invention, in the fuel tank cover device according to any one of the first to third aspects, the tank support 20 fixed to the crankcase 4 is provided with a vibration isolating rubber. The fuel tank 6 is characterized in that the tank flange 7 of the fuel tank 6 is vibration-isolated and supported via the fuel tank 6, and the tank cover 10 is rigidly attached to the tank support 20.

[0010]

According to the first aspect of the present invention, the tank cover 10 that covers the fuel tank 6 includes the left shoulder cover portion 10a and the right shoulder cover portion 1 that cover the left and right shoulder portions of the fuel tank 6.
0b, a front shoulder cover portion 10c covering the front shoulder portion of the fuel tank 6, and a left side cover portion 10e and a right side cover portion 10f covering left and right side portions of the headlight 13 provided on the front side of the fuel tank 6. And the tank cover 10 is divided into a plurality of parts.
To play.

(A) Even if the tank cover 10 is damaged, replacement parts and repairs thereof can be facilitated. That is, the tank cover 10 composed of the cover portions 10a, 10b, 10c, 10e, and 10f is divided into a plurality of portions, and the possibility of damaging the entire tank cover 10 is significantly reduced. Moreover, since only the damaged portion needs to be replaced, the cost of replacement parts is reduced. Further, if each part is made of a synthetic resin material, the cost of replacement parts is reduced. Furthermore, if each of the above parts is made of a sheet metal press, a slight dent or deformation can be easily repaired by punching out from the back side.

According to the second aspect of the present invention, in the fuel tank cover device according to the first aspect, the fuel supply port 8 is disposed at the center of the upper surface of the fuel tank 6, and the fuel reservoir 9 is provided around the fuel supply port 8. Since the recess is provided and the upper surface of the fuel tank 6 is covered with the tank cover 10 except for the filler port 8 and the fuel reservoir 9, the following operation and effect (b) are also obtained. (B) A margin is provided around the filler port of the fuel tank to facilitate cleaning of the filler port. That is, the upper surface of the fuel tank 6 has a cover portion 10 covering the left and right shoulder portions.
a · 10b and a front shoulder cover part 10 covering the front shoulder part
c, the periphery of the fuel supply port 8 at the center of the upper surface of the fuel tank 5 and the fuel reservoir 9 are exposed. That is, a sufficient margin for cleaning can be provided around the fuel filler 8. This makes it easy to clean around the filler port and the fuel reservoir 9, and to prevent clogging of the fuel filter and abnormality of the fuel supply system caused by foreign matter such as dust entering the fuel tank from the filler port. Can be prevented.

According to a third aspect of the present invention, in the fuel tank cover device according to the first or second aspect,
Upper tank part 6a and lower tank part 6 of fuel tank 6
Since the tank flange 7 welded to b is covered with the tank cover 10, the following operation and effect (c) are also obtained. (C) The tank cover 10 prevents a finger from being hung on the tank flange having low strength when the engine is lifted. That is, damage to the tank flange can be prevented by the protector function of the tank cover.

According to a fourth aspect of the present invention, in the fuel tank cover device according to any one of the first to third aspects, the tank support 20 fixed to the crankcase 4 is provided with an anti-vibration rubber. 22 through the fuel tank 6
Since the tank flange 7 is supported for vibration isolation and the tank cover 10 is rigidly attached to the tank support 20, the following operation and effect (d) are also obtained. (D) Mutual vibration between the fuel tank and the tank cover is cut off via the vibration isolating rubber 22, so that both of the fuel tank and the tank cover can be prevented from being damaged by resonance. In addition, even if an external impact is applied to the tank cover, the impact is absorbed by the vibration-proof rubber 22. Therefore, also in this respect, the protector function of the tank cover is significantly improved.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a perspective view of a horizontal diesel engine provided with a fuel tank cover device according to a first embodiment of the present invention, FIG. 2 is a left side view of the horizontal diesel engine, FIG. 3 is a plan view of the horizontal diesel engine, FIG. 4 is a front view of the horizontal diesel engine, and FIG.
FIG. 5A is an exploded perspective view showing an assembled state of a fuel tank and a tank cover, and FIG. 5B is a longitudinal sectional view of a main part showing a state of anti-vibration support.

This horizontal diesel engine E is shown in FIGS.
As shown in FIG. 8, the engine main body 1 is provided horizontally, and the engine main body 1 is provided with a cylinder head 2 and a cylinder block 3.
And the crankcase 4.
A radiator-type cooling device 5 is disposed above the cylinder block 3, and a fuel tank 6 is disposed above the crankcase 4.
Covered with 0. Here, the side of the cylinder head 2 of the horizontal engine E is defined as the rear, and the side of the crankcase 4 is defined as the front. In these figures, reference numeral 11 denotes a radiator cap, 12 denotes a cap of a fuel filler 8, 13 denotes a headlight of an engine, 14 denotes a lubrication pump, 15 denotes a fuel filter,
16 denotes an air cleaner, 17 denotes an exhaust muffler, and 18 denotes a flywheel.

As shown in FIGS. 1 to 4, the tank cover 10 includes a left shoulder cover portion 10a and a right shoulder cover portion 10b which cover left and right shoulder portions of the fuel tank 6, and a front and rear shoulder portion of the fuel tank 6. A front shoulder cover portion 10c and a rear shoulder cover portion 10d, a left side cover portion 10e and a right side cover portion 10f that cover left and right side portions of a headlight 13 provided on the front side of the fuel tank 6, and a headlight; And a lower cover portion 10g for covering the tank portion below the lower portion 13. The tank cover 10 is divided and assembled into a plurality of portions (blocks). Incidentally, in this embodiment, the left shoulder cover portion 10a and the left side cover portion 10e are combined into one block to form the right shoulder cover portion 10b and the right side cover portion 10e.
f, the front shoulder cover portion 10c, the rear shoulder cover portion 10d, and the lower cover portion 10g are each divided into one block and assembled.

The above-described structure enables easy replacement parts and repairs even if the tank cover 10 is damaged.
It is intended to provide a margin around the filler port. That is, the tank cover 10 constituted by the cover portions 10a to 10g is divided into a plurality of blocks, and the possibility of damaging the entire tank cover 10 is significantly reduced. Moreover, since only the damaged block needs to be replaced, the cost of the replacement part is much easier. Further, if each block is made of a synthetic resin material, the cost of replacement parts is reduced. Furthermore, if each of the blocks is made of a sheet metal press, a slight dent or deformation can be easily repaired by punching out from the back side.

As shown in FIG. 3, a fuel supply port 8 is provided at the center of the upper surface of the fuel tank 5, and a fuel reservoir 9 for containing spilled fuel is recessed around the fuel supply port 8. Is formed. The upper surface of the fuel tank 6 is covered by cover portions 10a and 10b covering left and right shoulder portions thereof and cover portions 10c and 10d covering front and rear shoulder portions thereof. Is exposed. That is, a sufficient margin for cleaning around the fuel filler 8 can be provided. This makes it easy to clean around the filler port and the fuel reservoir 9, and to prevent clogging of the fuel filter and abnormality of the fuel supply system caused by foreign matter such as dust entering the fuel tank from the filler port. Can be prevented.

The fuel tank 8 has a tank flange 7 in which an upper half tank portion 6a and a lower tank portion 6b are joined by seam welding. Covered. This is intended to prevent a finger from being put on the tank flange 7 having low strength when the engine is lifted. That is, the protector function of the tank cover 10 can prevent the tank flange 7 from being damaged.

As shown in FIG. 5, a front frame 20a and a rear frame 20b, each having a rectangular shape in a front view, are fixed to the crankcase 4.
a and the rear frame 20b constitute the tank support 20. The fuel tank 6 is spanned over a front frame 20a and a rear frame 20b, and as shown in FIG.
・ Put it at 22 to support vibration isolation Note that FIG.
Reference numeral 21 in (B) denotes a pressing stay, 23 denotes a space collar interposed between the pressing stay 21 and the rear frame 20b (or the front frame 20a), and 24 denotes a fixing bolt. Thus, the pressing stay 21 can be rigidly attached to the rear frame 20b (or the front frame 20a) while securing the elastic deformation of the vibration isolating rubbers 22.

Each of the cover portions 10a to 10g constituting the tank cover 10 is molded into a shape including a convex curved surface so as to increase rigidity and resist deformation.
These cover portions 10a to 10g are rigidly attached to the front and rear frames 20a and 20b as follows. In addition, the headlight 13 is previously arranged at the center of the rectangular frame of the front frame 20a and is rigidly attached. Also, the front shoulder cover portion 10c is placed on the front frame 20a,
"d" is rigidly mounted on the pressing stay 21 fixed to the rear frame 20b, and the lower cover portion 10g is rigidly mounted on the lower portion of the front frame 20a.

The left shoulder cover part 10 forming one block
a and the left side cover portion 10e are provided on the left side surface of the front frame 20a and the pressing stay 2 fixed to the rear frame 20b.
1 and is screwed over it. Similarly, the right shoulder cover portion 10b and the right side cover portion 10f, which form a pair of blocks, respectively, have the right side surface of the front frame 20a and the pressing stay 2 fixed to the rear frame 20b.
1 and is screwed over it. By removing the left and right blocks, maintenance of the headlamp 13 becomes possible.

According to the above configuration, the mutual vibration between the fuel tank 6 and the tank cover 10 is cut off through the vibration isolating rubber 22 to prevent the fuel tank 6 and the tank cover 10 from being damaged by resonance. be able to. In addition, even if an external impact is applied to the tank cover 10, the impact is absorbed by the anti-vibration rubber 22. Therefore, also in this respect, the protector function of the tank cover 10 is significantly improved.

FIGS. 6 to 8 show a horizontal diesel engine provided with a fuel tank cover device according to a second embodiment of the present invention. FIG. 6 is a left side view of the horizontal diesel engine, and FIG. FIG. 8 is a plan view of the engine, and FIG. 8 is a front view of the horizontal diesel engine.

Also in this embodiment, the tank cover 10
Left shoulder cover 10 covering left and right shoulders of fuel tank 6
a and a right shoulder cover portion 10b, a front shoulder cover portion 10c and a rear shoulder cover portion 10d covering front and rear shoulder portions of the fuel tank 6, and both right and left side portions of a headlight 13 provided on the front side of the fuel tank 6. The tank cover 1 includes a left side cover part 10e and a right side cover part 10f that cover the tank and a lower cover part 10g that covers a tank part below the headlight 13.
0 is divided into a plurality of blocks and assembled. Incidentally, in this embodiment, as shown in FIGS. 6 to 8, the left shoulder cover portion 10a and the right shoulder cover portion 1
0b and the front shoulder cover portion 10c in one block, the left side cover portion 10e, the right side cover portion 10f and the lower cover portion 10g in one block, and the rear shoulder cover portion 1
0d is divided into one block and assembled.

The present invention is not limited to the above-described embodiment, and various modifications may be made to the manner of dividing the tank cover and the form of the tank support within a range that does not change the gist of the present invention. Changes can be made.

[Brief description of the drawings]

FIG. 1 is a perspective view of a horizontal diesel engine including a fuel tank cover device according to a first embodiment of the present invention.

FIG. 2 is a left side view of the horizontal diesel engine.

FIG. 3 is a plan view of the horizontal diesel engine.

FIG. 4 is a front view of the horizontal diesel engine.

5 (A) is an exploded perspective view showing an assembled state of a fuel tank and a tank cover, and FIG. 5 (B) is a longitudinal sectional view of a main part showing a state of vibration-proof support.

FIG. 6 is a left side view of a horizontal diesel engine including a fuel tank cover device according to a second embodiment of the present invention.

FIG. 7 is a plan view of the horizontal diesel engine.

FIG. 8 is a front view of the horizontal diesel engine.

[Explanation of symbols]

2 ... cylinder head, 4 ... crankcase, 6 ... fuel tank, 6a ... upper half tank part, 6b ... lower tank part,
7: tank flange, 8: fuel filler, 9: fuel pool, 10 ...
Tank cover, 10a: left shoulder cover, 10b: right shoulder cover, 10c: front shoulder cover, 10e: left side cover, 10f: right side cover, 13: headlight, 2
0: tank support, 22: anti-vibration rubber, E: horizontal engine.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiichiro Yamada 3-8 Chikushinmachi, Sakai City, Osaka Inside Kubota Sakai Rinkai Plant (72) Inventor Minoru Kawahara 3-8 Chikushinmachi, Sakai City, Osaka Stock 3D038 CA03 CA15 CC00 in Kubota Sakai Coastal Plant

Claims (4)

[Claims] 1. A cylinder head (2) side of a horizontal engine (E) is defined as a rear side, a crankcase (4) side is defined as a front side, and a fuel tank (6) is provided above the crankcase (4). In a fuel tank cover device which is disposed and covers the fuel tank (6) with a tank cover (10), the tank cover (10) covers at least left and right shoulders of the fuel tank (6). Left shoulder cover part (10a)
And a right shoulder cover portion (10b), a front shoulder cover portion (10c) covering the front shoulder portion of the fuel tank (6), and both left and right headlights (13) provided on the front side of the fuel tank (5). A cover device for a fuel tank, comprising a left side cover portion (10e) and a right side cover portion (10f) that cover side portions, wherein the tank cover (10) is divided into a plurality of portions. . 2. A fuel tank cover device according to claim 1, wherein a fuel filler port (8) is provided at a central portion of an upper surface of the fuel tank (6), and a fuel reservoir is provided around the fuel filler port (8). (9) The fuel tank characterized in that it is recessed and covered with the tank cover (10) on the upper surface of the fuel tank (6) except for the filler port (8) and the fuel reservoir (9). Cover device. 3. The fuel tank cover device according to claim 1, wherein the upper tank part (6a) and the lower tank part (6b) of the fuel tank (6) are welded. A cover device for a fuel tank, wherein a tank flange (7) is covered with the tank cover (10). 4. The fuel tank cover device according to claim 1, wherein the tank support (2) is fixed to the crankcase (4).
0), the tank flange (7) of the fuel tank (6) is vibration-isolated and supported via a rubber cushion (22), and the tank cover (10) is rigidly attached to the tank support (20). A cover device for a fuel tank.